1 /* 2 * Copyright 2022 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.google.android.libraries.mobiledatadownload.downloader; 17 18 /** Network related constants. */ 19 public final class Constants { 20 Constants()21 private Constants() {} 22 23 /** The HTTP {@code HEAD} request method name. */ 24 public static final String HEAD_REQUEST_METHOD = "HEAD"; 25 26 /** The HTTP {@code ETag} header field name. This is used to detect content change. */ 27 public static final String ETAG_HEADER = "ETag"; 28 29 /** 30 * The HTTP {@code If-None-Match} header field name. This is used to send ETag to server to detect 31 * content change. 32 */ 33 public static final String IF_NONE_MATCH_HEADER = "If-None-Match"; 34 35 public static final int HTTP_RESPONSE_OK = 200; 36 public static final int HTTP_RESPONSE_NOT_MODIFIED = 304; 37 public static final int HTTP_RESPONSE_NOT_FOUND = 404; 38 } 39